The invention relates to a fixed wing unmanned aerial vehicle with a sprinkling system. The sprinkling system comprises containers, a pump, sprinkling pipes and nozzles, the nozzles are connected with the pump through the sprinkling pipes, and the pump is connected with the containers through the sprinkling pipes; the containers are symmetrically distributed along the symmetry plane of a wing and are arranged at the center of gravity of the unmanned aerial vehicle; the nozzles are distributed along the wingspan, and the sprinkling pipes connecting the nozzles and the pump are arranged on the lower portion of the wing; and the sprinkling pipes comprises a left outer extension sprinkling pipe and a right outer extension sprinkling pipe, and the outer extension sprinkling pipes extend outwards from a wingtip in the wingspan direction. The advantages of the fixed wing unmanned aerial vehicle with the sprinkling system is embodied in agricultural application, the fixed wing unmanned aerial vehicle can be applied to pesticide spraying, pest control and the like, by arranging the outer extension sprinkling pipes additionally, the spraying area can be extended, the spraying performance is improved, and efficient spraying is realized.